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Lennart Lindegren. Profile picture.

Lennart Lindegren

Professor

Lennart Lindegren. Profile picture.

Determination of star formation histories from gaia-type photometric and astrometric survey data

Author

  • Bjarne Rosenkilde Jørgensen
  • Lennart Lindegren

Summary, in English

To understand the evolution of the Milky Way Galaxy requires detailed knowledge of the star formation history of various populations. The vast amounts of photometric and astrometric data provided by the Gaia mission give unprecedented opportunities in this area. The relationships between the observed data and the ages of stars are however complex and highly non-linear and great care must be taken in analyzing the data. We describe a Bayesian approach to calculate the star formation rate (SFR) from astrophysical data, using a genetic algorithm to solve the basic integral equation. We present simulations showing that the method is capable of resolving structures in the SFR that cannot be seen from a distribution of the individually estimated stellar ages.

Department/s

  • Lund Observatory - Undergoing reorganization

Publishing year

2005

Language

English

Pages

171-173

Publication/Series

European Space Agency, (Special Publication) ESA SP

Volume

576

Document type

Conference paper

Publisher

European Space Agency

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Evolution
  • Populations
  • Galaxy
  • Stellar ages

Conference name

Symposium - The Three-Dimensional Universe with Gaia

Conference date

2004-10-04 - 2004-10-07

Conference place

Paris, France

Status

Published

ISBN/ISSN/Other

  • ISSN: 0379-6566
  • ISSN: 1609-042X